blimp: Move BlimpCompositor to use delegated rendering.

blimp/client/core/compositor/BUILD.gn

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 source_set("compositor") {
   visibility = [ "//blimp/client/*" ]
 
   sources = [
     "blimp_client_picture_cache.cc",
     "blimp_client_picture_cache.h",
     "blimp_image_decoder.cc",
     "blimp_image_decoder.h",
+    "blimp_output_surface.h",
     "blob_image_serialization_processor.cc",
     "blob_image_serialization_processor.h",
     "decoding_image_generator.cc",
     "decoding_image_generator.h",
+    "delegated_output_surface.cc",
+    "delegated_output_surface.h",
   ]
 
   deps = [
     "//blimp/net",
     "//third_party/libwebp",
   ]
 
   public_deps = [
     "//base",
     "//blimp/common",
     "//blimp/common/proto",
     "//cc",
     "//skia",
   ]
 }
 
 source_set("unit_tests") {
   visibility = [ "//blimp/client/core:unit_tests" ]
 
   testonly = true
 
   sources = [
     "blimp_client_picture_cache_unittest.cc",
+    "delegated_output_surface_unittest.cc",
   ]
 
   deps = [
     ":compositor",
     "//blimp/test:support",
+    "//cc:test_support",
     "//skia",
     "//testing/gtest",
   ]
 }